I can start maybe by speaking to baby foods.
In fact the addition of salt and sodium to baby food, and particularly to infant food, is regulated. We do have stringent requirements for the addition of salt to infant food. They are mandated by regulation. These levels are so low that industry does not resort to the addition of salt in infant food, so it doesn't seem to be a category right now that would be posing a challenge specifically for infants. Again, industry has resorted to no addition.
And the other part of the question...? I'm sorry, maybe....